Lion's Purge (4e Power)

From D&D Wiki

Lion's Purge: The most beneficial utility yet. Guarantees the removal of one negative condition once every encounter. Since mobility is key for any Striker, conditions such as immobilize can mean certain doom. The downside is this ability is a Standard Action so you cannot attack during this round. And since you are a Striker, a round with no damage is no round at all.